In 2004, KartOO search-engine launched a new version called UJIKO (they are actually the five keys on the keyboard like the concept of QWERTY). The interface looks more like a "jukebox" with the linked sites as playlists. The brand new version of UJIKO evolves with your expertise: The more you use it, the more functions it is able to offer .
Basic principle: each time you visit a new site, you are gaining one point of expertise. With every 10 points, you move to the next level. Your search engine is mutating, new buttons appear giving you access to advanced features (search video, images, news, encylopedia, advanced filters, animated skins, web archive, traffic details...)
Animated transitions between each level are displayed to show you the new tools, which you have just acquired.
1 new site visited = +1 point of expertise
10 points = +1 level